Burr remover for slotting machines and the like



Nova 21, 1950 R. u wu.cox 2,531,240

BURR REIIOVER FOR SLOTTING MACHINES AND THE LIKE Filed Oct. 8, 1945 3 Sheets-Sheet 1 R. L. WILCOX Nov. 21, 1950 EUR REMOVER FOR SLOTTING MACHINES AND THE LIKE Filed Oct. 8, 1945 3 Sheets-Sheet 2 Nov. 21, 1950 R. L. WILCOX 2,531,240

BURR REMOVER FOR SLOTTING MACHINES AND THE LIKE 3 Sheets-Sheet 3 Filed Oct. 8, 1945 Patented Nov. 21,1950

mum armovaa roa SLOTTING MACHINES AND THE

LIKE

Richard Lester Wilcox, Waterbury, Conn., as-

signor to The Waterbury Farrel Foundry and Machine Company, Waterbury, Conn., a corporation of Connecticut Application October 8, 1945, Serial No. 621,135

12 Claims. 1

This invention relates to burr removers for slotting machines and the like, and more particularly to a device adapted to be secured to a machine for slotting the heads of screws, for example, which device will be automatically operated and so timed that after the slot has been formed in the screw head any burrs which may exist at the ends of the slot will be cleanly and accurately removed without gouging the head of the screw.

The device shown in the present application is adapted to be applied to slotting machines, such, for example, as are shown in United States Patents Nos. 884,486, 1,029,653 and 1,584,263, although its use is not confined to a particular type of slotting machine. In the past, burr removers have been employed which consisted of a single cutting tool arranged to move in an arcuate path or about the axis of the actuating shaft as a center, the tool being rigidly fixed with rela tion to the actuating shaft so that it moves in a ed path.

arious disadvantages of such a construction have been experienced in that, if the head of the screw blank is-not concentric with the shank or if the notches in the dial which carries the screw blank have not been accurately formed, the cutterimay not engage the head of the screw, and, therefore, the blank would pass through the device without the burr being removed. Also, while the larger burr usually occurs at one end of the slot, nevertheless, in many slotting machines objectionable burrs occurred at both ends of the slot, and it is, therefore, desirable instead of employing a single cutting or burr removing tool, to arrange a pair of these tools So that one will engage the blank at each end of the slot and, therefore, remove both burrs.

It is also desirable to so mount the cutting tool that it may be capable of a limited movement with respect to the actuating shaft, so that it may accurately engage the blank and cleanly remove; the burr therefrom in spite of inaccuracie's' in the concentricity of the head of the screw with relation to the shank and also inaccuracies in the screw-receiving slots in the screwcarrying dial.

One. object of the present invention, therefore, is to provide a burr removing device of novel form which will always engage the screw head and cleanly remove the burr therefrom.

Another object of the invention is to provide a burr removing device having cutters to engage the screw at both ends of the slot milled there.

2 in, so as to cleanly remove any burrs which exist at either or both ends of the slot.

A still further object of the invention is to provide a screw slotting machine or like mechanism having a burr remover which shall be automatically actuated to remove the burr or burrs resulting from the slotting operation, which burr remover shall be provided with a cutter or cutters having limited movement with respect to the actuating shaft and being spring pressed into po-. sition to accurately engage the head of the blank to remove the burrs therefrom.

To these and other ends the invention consists in the novel features and combinations of parts to be hereinafter described and claimed.

In the accompanying drawings:

Fig. 1 is a side elevational view of a portion of a screw slotting machine provided with a burr remover embodying my invention;

Fig. 2 is a sectional view on line 22 of Fig. 1;

Fig. 3 is a top plan view of a part of a bed of the machine, showing the burr remover and associated mechanism;

Fig. 4 is a sectional view on line 4-4 of Fig. 3;

Fig. 5 is a sectional view on line 5-5 of Fig. 4;

Fig. 6 is a sectional view on line 0-6 of Fig. 3;

Fig. 7 is an enlarged detail plan view of the operating ends of the cutting tool;

Fig. 8 is a front elevational view of the parts shown in Fig. 7;

Fig. 9 is a composite view showing the end of one of the cutting tools in side elevation and front elevation; and

Fig. 10 is a view of the head portions of two screws shown before and after the burr removing operation.

To illustrate a preferred embodiment of my invention, I have shown a portion of a screw slotting machine comprising a main frame Iii having a bed H above which is rotatably mounted a power shaft I2 upon which is pivoted a saw frame I3. A shaft it is rotatably mounted in this frame, upon which shaft is secured the slotting saw it. The shaft It is rotated from the shaft 12 by means of the meshing gears i6 and ii shown in Fig. 2, and it will be noted that with this arrangement the saw frame l3 may be oscillated about the shaft 12 while these gears are still in mesh.

Pivoted to the frame I3 is a rod l8 pivoted at its lower end to a block i9 adjustably secured in a lever 20 pivoted to the frame at M, this lever carrying a roller- 22 adapted to be engaged by the periphery of the cam 23, the. roller being held against the cam by the spring 24. The

spring normally holds the frame i3 in raised position, so that the cutter is out of engagement with the work, and, at the proper time, the cam 23 rocks the lever downwardly about its pivot 2| so as to bring the cutter into contact with the work.

Rotatably mounted on the bed is an indexing dial 28 haying slots 21 milled therein, which slots are adapted to receive the work blanks from a chute 23. It will be understood that by appropriate mechanism (not shown), which is old in the art. the dial 28 is moved intermittently in a counter-clockwise direction so as to carry the screw blanks from a position near the end of the chute 23 to a position below'the saw i3, which usually will be approximately 90, with relation to the surface of the dial, from the position of the chute. Atthis point, the blank will be gripped and held in the notch 21 by a disk 23 fixedly secured in an arm 30 pivoted to the bed by'the stud 3i, so that this am may be advanced toward and from the stud at the proper time to grip the blanks when they are being operated upon by the saw.

' My improved burr removing mechanism will now be described, and is shown more particularly in Figs. 3 to 9 of the drawings. In the frame iii of the machine is rotatably mounted a shaft 35, upon the upper end of which is secured a carrying arm 38, this carrying arm being provided upon its free end with a groove 31 in which is slidably-mounted a tongue 33 upon the lower surface ofa finger block 33. It may be noted that the tongue 33 is slightly narrower than the groove 31 so that this block will not only slide in the groove but will have a limited pivoting or swinging movement therein. I a

' This finger block 33 is provided-with a central raised portion 40 having an elongated slot 4i therein, which slot is of the proper width to fit snugly the outer diameter of a stud 42 rotatably mounted in the arm 38. Adjusting screws 43 and 44 provide for longitudinal adjustment of the finger' block 33 with respect to the stud 42 and the arm 38 to adjust the position of the block with respect to the arm, the tongue 33 sliding in the groove 31 during this adjustment. The stud 42 while rotatably mounted in the arm 3 is otherwise fixed against movement therein, and, as the finger block 33 is in practice fixed to the stud 42 by the set screws 43 and 44, the block is permitted a slight oscillating movement with respect to the arm 33 due to the loose fit of the tongue 33 in the groove 31.

Upon each side of its central portion 43, the finger block is provided with laterally extending wings 43 and 41, upon which finger holders 43 and 43 are pivotally mounted by means of studs Iii and ii. which studs are keyed to the finger holders but rotatably mounted in the wings. Upon the upper surfaces of these finger holders are se-' cured cutters 53 and 34 by screws 33, these cutters being rigidly secured to the finger holders. Ad-

. lusting screws 33 are mounted transversely in the holders. Thus the pin 33 tends to spread the rear ends of the finger holders 40 and 43 and the cutters 53 and 54 and, therefore, tends to keep the forward or working ends of the cutter at a minimum distance apart as permitted by the screws 53 but allowing the forward ends of the cutter to spread apart when an opening force is applied thereto, as, for instance, when they engage the work. When the .forward ends of the cutters are spread apart in this manner, the pin 33 will be cammed rearwardly against the force of the spring 30.

The forward ends of the cutters are shown more especially in Figs. 7 and 8. If they are adapted to operate upon a screw with a beveled head, their adjacent surfaces will be correspondingly beveled as shown at 63 and 84, and adjacent their ends are provided with burr removing or cutting edges 33 and 33 formed by recesses 61 and 63 which lie forwardly of these cutting edges. It will be noted that the cutting edge 65 is at a greater distance from the end of the cutter finger 53 than is the cutting edge 33 from the end of the cutter 34. This provides cutter 53 with an elongated nose or end, so that this cutter will first come into engagement with the work.

In practice, the screws 56 are so adjusted that the openings between the forward ends of the cutters will be slightly less than the diameter of the head of the work, so that when the cutters are moved forwardly, they will be slightly spread by the entrance of the work therebetween, and

, each cutting edge will bear closely against the work so as to cleanly remove the burr therefrom without removing additional metal. In the forward movement of the cutters, the longer nose of the cutter 33 first engages the work and guides the cutters in relation thereto, the cutters being allowed a slight-swinging movement by the loose -fit of the tongue 33 of the finger block in the groove 31 of the arm 34. Thus even if the position of the work is not always strictly accurate,

the cutters are permitted this small movement so that they will be guided properly into engagement with the work, and the spreading movement permitted by the pivoting of the cutter or finger holders upon the pins 53 and Ii provides for a clean removal of the burrs.

As will be seen, the ourr removing operation takes place at the same position of the dial 26 at which the screw is slotted by the saw or cutter I5. As shown in the drawing, the operation is performed upon a screw with a beveled head, the screw being shown in Fig. 10 at 10 having a slot ll cut therein and burrs I2 and 13 at each end of the slot. The right hand view of Fig. 10 shows the screw after the burr has been removed. It is, therefore, necessary for the cutting action to take place in timed relation with the upward movement of the cutter frame i3 after the slotting operation has been performed. This is accomplished by providing an arm 14 on the shaft 35, the free end of which arm is adapted to engage the side i'ace of a cam 15 mounted upon the shaft 13 which carries the cam 23, which latter cam actuates the saw frame i 3. Thus the oscillation ofthe shaft 35 will effect swinging movements of the arm 36 to advance the cutters toward the work after the saw has been raised therefrom. The arm 14 is maintained in engagement with the cam 15 bya spring 11 acting on an arm 18 which is also fixed to the shaft 35. It is believed that the operation of the device will be clear from the foregoing description.

As stated. the screws are received in the neath the saw l5. This saw descends and cuts the slots in the screws and is moved to raised position. At this time, the shaft 35 is oscillated to swing the arm 36 and advance the cutters across the work to remove the burr therefrom. During both slotting and burr removing operations, the work is held firmly in position by the disk 29 in the arm 30.

While I have shown and described a preferred embodiment of my invention, it will be understood that it is not to be limited to all of the details shown, but is capable of modification and variation within the spirit of the invention and within the scope of the claims.

What I claim is:

1. A screw slotting machine having a frame, a cutter frame mounted thereon for swingingv movement, a slotting cutter on said cutter frame, a dial rotatably mounted on the first-named frame to move the work into position to be acted upon by said cutter, means for advancing the cutter toward the face of the dial, a pair of spaced trimming tools operatively mounted on the frame for movement in a direction substantially transverse to the movement of the cutter frame, and means on the first-named frame for advancing said tools across the face of the dial to embrace the work and simultaneously trim opposite sides thereof.

2. A screw slotting machine having a tram a cutter frame mounted thereon for swinging movement, a slotting cutter on said cutter frame, a dial rotatably mounted on the first-named frame to move the work into position to be acted upon by said cutter, means for gripping the work while it is engaged by the cutter, means for advancing the cutter toward the face of the dial, a pair of spaced trimming tools operatively mounted on the frame for movement in a direction substantially transverse to the movement of the cutter frame, and means on the first-named frame for reciprocating said tools across the face of the dial to embrace the work and trim opposite sides thereof while the work is held by said gripping means.

3. A screw slotting machine having a frame, a cutter frame mounted thereon for swinging movement, a slotting cutter on said cutter frame, a dial rotatably mounted on the first-named frame to move the work into position to be acted upon by said cutter, means for gripping the work while it is engaged by the cutter, means for advancing the cutter toward the face of the dial, a pair of spaced trimming tools operatively mounted on the frame for movement in a direction substantially transverse to the movement of the cutter frame, and means on said first-named frame for reciproeating said tools across the face of the dial to embrace the work and trim opposite sides thereof while the work is held by said gripping means, the advance of the tools being effected in timed relation with, but subsequent to, the engagement of the cutter with the work.

4. A screw slotting machine comprising a frame, a cutter frame mounted on said firstnamed frame for swinging movement toward and from the work, a slotting cutter rotatably mounted thereon, means on the first-named frame for holding the work for engagement of the cutter therewith, a tool carrier movably mounted on the frame, a burr cutter mounted on said carrier, means for advancing the carrier in a direction substantially transverse to the movement of the cutter frame to move said burr cutter into engagement with the work while held by said holding means, and means mounting said burr cutter on the carrier for limited movement with respect thereto to permit the burr cutter to adjust itself to the position of the work.

5. A screw slotting machine comprising a frame, a cutter frame mounted on said firstnamed frame for swinging movement toward and from the work, a slotting cutter rotatabiy mounted thereon, means on the first-named frame for holding the work for engagement of the cutter therewith, a tool carrier movably mounted on the frame, a burr cutter mounted on said carrier, means for advancing the carrier in a direction substantially transverse to the movement of the cutter frame to move said burr cutter into engagement with the work while held by said holding means, and means mounting said burr cutter on the carrier for limited movement with respect thereto to permit the hair cutter to adjust itself to the position of the work, and means operatively connected to the burr cutter for urging the latter against the surface of the work.

6. A screw slotting machine comprising a frame, a cutter frame mounted on said firstnamed frame for swinging movement toward and from the work, a slotting cutter operatively mounted thereon, means on the flrst-named frame for holding the work for engagement of the cutter therewith, a tool carrier movably mounted on the frame, a pair of burr cutters, means mounting said burr cutters on said carrier with their forward ends in spaced relation to receive the work therebetween and for relative separating and approaching movements, means urging said burr cutters toward each other and means for moving said carrier in a direction substantially transverse to the movement of the cutter frame to move said burr cutters into engagement with opposite sides of the work while the latter is held by said holding means.

7. A screw slotting machine comprising a frame, a cutter frame mounted on said first named frame for swinging movement toward and from the work, a slotting cutter operatively mounted thereon, means on the first-named frame for holding the work for engagement of the cutter therewith, a tool carrier movably mounted on the frame, a pair of burr cutters, means mounting said cutters on said carrier with their forward ends in spaced relation to receive the work therebetween and for relative separating and approaching movements, means operatively connected to the burr cutters urging said burr cutters toward each other, and means for moving said carrier in a direction substantially transverse to the movement of the cutter frame to move said burr cutters into engagement with opposite sides of the work while the latter is held by said holding means and one of said burr cutters projecting beyond the other whereby it will first engage the work.

8. A screw slotting machine comprising a frame, a cutter frame mounted on said firstnamed frame for swinging movement toward and from the work, a slotting cutter operatively mounted on said cutter frame, means on the first-named frame for holding the work for era-- relative separating and approaching movements,

means operatively connected to the burr cutters.

urging said burr cutters toward each other, means on the firstfn'amed frame for moving the slotting cutter into'and out of engagement with one face of the work, and means for advancing the carrier-in a direction substantially transverse to the swinging movement of the cutter to advance the burr cutters into engagement with other faces of the work in timed relation with the movement of the slotting cutter.

9. A screw slotting machine comprising a frame, a cutter frame mounted on said firstnamed frame for swinging movement toward and from the work. a slotting cutter operativeiy mounted thereon, means on said first-named frame for holding the work for engagement of the cutter therewith, means for advancing the cutter frame toward the work, a tool carrier movably mounted on the frame, a support on said carrier, a pair of burr cutters mounted on said support in spaced relation with each other, means on said first-named frame for advancing said carrier in a direction substantially transverse to the movement of the-cutter frame to.

cause the burr cutters to engage the work, said burr cutters being movably mounted on the support for approaching and separating movement, and means operatively connected to said burr cutters to yieldably hold them against separation.

'10. A screw slotting machine comprising a frame, a cutter frame mounted on said firstnamed frame for j swinging movement toward and from the work, a slotting cutter operatively mounted thereon, means on the first-named frame for holding the work for engagement of the cutter therewith, means for advancing the the cutter therewith. means for advancing the cutter frame toward the work, a tool carrier movabiy mounted on the frame, a support on said carrier, apair of burr cutters mounted on said support in spaced relation with each other, means on said first-named frame for advancing said carrier in' a direction substantially transverse to the movement of the cutter, frame to cause the burr cuttersto engage the work, said burr cuttersfbeing movably mounted on the support for approaching and separating movement, means operatively connected to said burr cutters to yieldably hold them against separation, and means adJustably limiting the approaching movement of the cutters.

11. A screw slotting machine comprising a frame, a cutter frame mounted on said firstnamed frame for swinging movement toward and from the work, a slotting cutter'operatively mounted thereon, means on said first-named frame for holding the work for engagementof cutter frame toward the work, a tool carrier movably mounted on the frame; a support on said carrier, a pair. of burr cutters mounted on said sup- Port in spaced relation with each other, means on said first-named frame for advancing said carrier in a direction substantially transverse to the movement of the cutter frame to cause the burr cutters to engage .the. work, said cutters being movably mounted on the support for approaching and separating movement, means operatively'connected to said burr cutters to yieldably hold; them-against separation, and means mounting said support for limited movement on the carrier whereby the cutters, may move as a unit to accommodate themselves to the position of the work. v

12. A screw slotting machine comprising a frame, a cutter frame mounted on said firstnamed frame for swinging movement toward and from the work, a slotting cutter operatively mounted thereon, means on said first-namedframe for holding the work for engagement of the cutter therewith, .means for advancing the cutter frame toward the work, a tool carrier movably mounted on the frame, a support on said carrier, a pair of burr cutters mounted on said support in spaced relation with each other, means on said first-named frame for advancing said carrier in a direction substantially transverse to the movement of the cutter frame to cause the burr cutters to engage the work, said burr cutters being movably mountedon the support for approaching and separating movement, means operatively connected to said burr cutters to yieldably hold them against separation, and means mounting said support on the carrier for adjustment in the direction of movement of the I burr cutters.

RICHARD WILCOX.

BEFERENQES CITED The following references are of record in the filc of this patent: I

UNI'IED STATES PAmrs 

